We recently migrated all of our FTP traffic to WingFTP, and it's been a pretty smooth transition but one of our clients is having issues connecting with a lftp client. They get the error below and the connection drops out. I'm still trying to get some more information from the client, but I'm wondering if there's been any reports of issues with lftp clients.... Any insight would be much appreciated. Thanks.

Ok, seems to be a problem with lftp attempting to force TLS, and because I don't have TLS configured it's not working. Is there a way to disable TLS so the server tells the client to try without? I'm guessing I might be kinda screwed and the client will either have to change something or I'll have to get TLS configured, but if you have any ideas, let me know.